I need to check the existence of an input argument. I have the following script
if [ "$1" -gt "-1" ]
then echo hi
fi
I get
[: : integer expression expected
How do I check the input argument1 first to see if it exists?
Bash - Check existence of input argument in a Bash shell script
bashshell
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Best Solution
It is:
The
$#variable will tell you the number of input arguments the script was passed.Or you can check if an argument is an empty string or not like:
The
-zswitch will test if the expansion of"$1"is a null string or not. If it is a null string then the body is executed.